I used a sheet of manila drawing paper as a blotter while doing some paper staining. Then I folded the blotter into an envelope.
Some more mailart you might like
I was born in Louisville, Kentucky, USA, in 1947. I was a classroom teacher of various subjects for 25 years before becoming a school librarian at which I labored for 18 years. I finally retired at the end of the 2015/16 school year, figuring that 43 years was long enough. I have been married for 44 years and have five children and three grandsons.